I can't access the dashboard (4 posts)

HI,I can't access my dashboard. Everytime when I tried it , they said I am no authorised for access. I have to go as an invited person. And I changed my username and password and now, When I try do access the dashboard, or the articles from the blog, it's error.
One more thing, I am the owner of the blog. After I installed the WordPress, the address was changed as http://www.xyz-think.com/wordpress/. I want only http://www.xyz-think.com, and I don't know what to do.Somebody told me I should delete wordpress and reinstall it, but I don't know how to do and I don't know if is a good solution.
Thanks.

HI,I can't access my dashboard. Everytime when I tried it , they said I am no authorised for access. I have to go as an invited person. And I changed my username and password and now, When I try do access the dashboard, or the articles from the blog, it's error.

When you installed wordpress did give all privileges when creating database.

@ Lilianad, I had the same problem when I first installed word-press on my site, but the solution is simply what Elan Technosys just posted. Copy the word-press files to your root folder of your site, or make word-press your primary site by redirecting your domain name to point to that folder before installation